Here is 2 simple way of determining the length of a canoe paddle:
Way 1 ) sit in a chair , Your legs don’t have a lot to do with your paddle size, lift your handle , measure the distance between the chair to your palm center . the paddle length depend on your torso and arm length.
Way 2 )
Sit in a chair and measure the distance from the chair seat to your eye-level, this is the length of your shaft and grip.
Add the blade length of the paddle model you like to have the total paddle length. Overall canoe paddle length is measured in a straight line from the tip of the blade to the top of the grip.
The best way of choosing a paddle, as far as possible, is to try it out!